ATmega162 datasheet(234/324 Pages) ATMEL

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234

2513K–AVR–07/09

ATmega162/V

Latching of Fuses

The Fuse values are latched when the device enters Programming mode and changes of the

Fuse values will have no effect until the part leaves Programming mode. This does not apply to

the EESAVE Fuse which will take effect once it is programmed. The Fuses are also latched on

Power-up in Normal mode.

Signature Bytes

All Atmel microcontrollers have a 3-byte signature code which identifies the device. This code

can be read in both Serial and Parallel mode, also when the device is locked. The three bytes

reside in a separate address space.

For the ATmega162 the signature bytes are:

0x000: 0x1E (indicates manufactured by Atmel).

0x001: 0x94 (indicates 16KB Flash memory).

0x002: 0x04 (indicates ATmega162 device when 0x001 is 0x94).

Calibration Byte

The ATmega162 has a one-byte calibration value for the internal RC Oscillator. This byte

resides in the high byte of address 0x000 in the signature address space. During Reset, this

byte is automatically written into the OSCCAL Register to ensure correct frequency of the cali-

brated RC Oscillator.

Parallel

Programming

Parameters, Pin

Mapping, and

Commands

This section describes how to parallel program and verify Flash Program memory, EEPROM

Data memory, Memory Lock bits, and Fuse bits in the ATmega162. Pulses are assumed to be at

least 250 ns unless otherwise noted.

Signal Names

In this section, some pins of the ATmega162 are referenced by signal names describing their

functionality during parallel programming, see Figure 96 and Table 101. Pins not described in

the following table are referenced by pin names.

The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.

The bit coding is shown in Table 103.

When pulsing WR or OE, the command loaded determines the action executed. The different

Commands are shown in Table 104.

Figure 96. Parallel Programming

VCC

+5V

GND

XTAL1

PD1

PD2

PD3

PD4

PD5

PD6

PB7 - PB0

DATA

RESET

PD7

+12 V

BS1

XA0

XA1

RDY/BSY

PAGEL

PA0

BS2

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